Malicious PDF — malware analysis report

Static analysis result for SHA-256 4779e5da6dadb2f0…

MALICIOUS

PDF

80.9 KB Created: 2021-03-14 23:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8cb86364f862208a1587edf6a38d4d5b SHA-1: 8ea9a4e3a060c6ca301ee73bf8a09840ef5528fd SHA-256: 4779e5da6dadb2f0d58d1853ebb73800dd4c6af0ed4f3dcbe6867ef6e4b9d5c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with one specifically pointing to 'jacksth.ru/award' and a keyword suggesting a lure. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/award?keyword=comparative+superlative+games+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488103/normal_6049e6f9e9230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_6031b085195e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445101/normal_5fdec97cbdd80.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/03XdciE/bore_gauge_checker.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/Nhigihc/drive_link_paylasma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_5fe91432cbe95.pdfIn PDF document text
    • http://megaliwuxo.22web.org/73891999098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479942/normal_5fc9054b34da1.pdfIn PDF document text
    • https://cdn.sqhk.co/nafolekuge/VMqFijH/snake_eyes_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_602c03b71a797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470836/normal_604b587c2b01f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebipijofozit.rf.gd/54548540515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5facf6a-4eb9-48c0-b9bd-02795bd7c751/how_to_get_autocad_full_version_for_free.pdfIn PDF document text
    • http://logururud.epizy.com/baixar_reader_foxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc2ec2f-5872-414b-9af9-d828c47aa223/what_if_i_dont_have_a_scoring_stylus_for_cricut.pdfIn PDF document text
    • http://ludujefu.epizy.com/midas_m32_operating_manual.pdfIn PDF document text
    • http://puwigedonokapav.epizy.com/information_technology_manager_jobs_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a8ebbd-db93-44dd-a69f-42ac55124f16/eureka_airspeed_exact_pet_filter_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14904663-cd83-4a9d-a05c-273f703a920d/87613470583.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 5324 bytes
SHA-256: 4316663fcc1ce41e90d5e7d46c930b94263708854a4892c3482c16191cc9c264
font_01_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 10804 bytes
SHA-256: 1e07dbd83c784f55622656c84acf09ce5bcc2947f372cb3555d9407bdea1d726

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